Adjustable tap



` 'A. F. B'REITENSTEIN.

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Ol/ PN i l MIM A. F. BREITEN EIN.

AnJusTAB v APPLICATION FILED OCT. 3.192

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ALBERT IE. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSGNOR TO THEGEOMETRIC TOOL CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

ADJUSTABLE TAP. l

Application filed Octoberl 3, 1921.

' ing at. New Haven, in the county of New Haven and State ofConnecticut,ihave in-` vented a new and useful Improvement in AdjustableTaps; and I do hereby declare the following, when taken in connectionwith the accompanying drawings and the characters of reference markedthereon, to be a full, clear, andexact description of the same, andwhich said drawings constitute part of this application, and represent,in

Fig. 1 a view in side elevation of my improved adjustable tap.

Fig. 2 a view thereof in front elevation.

Fig. 3 a view thereof in rear elevation.

F ig. 4 a view thereof in central longitudinal section on the line 4 4of Fig. 2.

Fig. 5 a view thereof on the line 5-5 of Fig. 2.

Fig. 6 a detached View in side elevation of the tapered adjListing-head, with its diametrically slotted stem.

Fig. 7 a view thereof in front elevation.

F ig. 8 a detached view of the adjusting cross-piece.

My invention relates to an improvement in adjustable taps, the objectbeing to produce a. simple, compact, efcient and durable tap ofcomparatively few parts and constructed with particular reference toconvenience, accuracy and stability of adjustment.

lith these ends in view, my invention consists in an adjustable taphaving certain details of construction and combinations of parts as willbe hereinafter described and pointed out in the claim.

In carrying out my invention, as herein shown, I employ a taperedadjusting-head 10 having a stem 11 formed with a diametrical slot 12receiving an adjusting cross-piece 13 connecting the stem 11 and hencethe head 10 with an internally-threaded adjustingcollar 14 mounted uponthe threaded shoulder 15 of the tap-body 16, which is formed, as' shown,with six centrally intersecting radial slots 17 for the reception of asmany dies or chasers 18, the slanting inner edges of which are formedwith coupling-slots 19 for the reception of complementary overhangingcoupling-ribs 20 formed upon the head 10, whereby the chasers arecoupled thereto and held in place thereby, as may be required in the useof the tap or to com- Seliai No. 504,960.

pensate for wear. The overhanging ribs 20 of the head 10 converge fromto front to conform to the taper thereof, while the inner edges of thechasers are cut at an angle and grooved to correspond to the .f vpitchof the overhanging ribs 20, as clearly shown.

The adjusting-collar 14 aforesaid is formed with a forwardly extendingsleeve 21 reaching over the cross-piece 13 and en- 65 circling therearportion of the tap-body 16. T he collar proper is formed at fourequidlstant. points with s'panner-holes 22, here shown as provided withhardened bushings 23. The inner end of the stem 11 of the 70 f head 10is formed with a threaded bore 24 for the reception of a screw 25, thehead 26 of which lits within the bore 27 of the hollow tap-shank 28. Thesaid screw is encircled by a retracting-spring 29 impinging 75 at itsrear end upon the under face of the screw-head 26, and at its' forwardend upon a washer 30 resting upon an annular shoulder 31 located in thebore 27 of the shank 28. The outer ends of the slots 17 in the tap- 80body 16 are closed by means of a cap 32 secured in place by screws 33,whereby the chasers are held against forward displacement.

For locking the adjusting-collar 14 in any 85 position in which it maybe set, I employ a bronze shoe 34, set into a. transverse notch in itsthreaded inner face and jammed upon the threads of the shoulder 15 ofthe tapbody 16 by means of a set-screw 35, as' shown 90 in Figure 3.

Normally, the tension of the retractingspring 29 will hold the forwardend wall of the slot 12 in the stem 11, against the forward edge of theadjusting cross-piece 13, the ends of the rear edge of which are talsoheld by the spring against the forward face of the collar, as shown inFigure 4, whereby back-lash 1s taken up, and the chasers maintained inaccurate predetermined ad.

justment.

If it is desired to compensate for wear or to increase the diameter ofthe hole threaded by the chasers 18, the set-screw 35 1s' loosened so asto release the adjusting- 105 collar 14, which is now turned clockwisewith the effect of positively forcing the adjusting cross-piece 13forward, and thus positively forcing the head 1() forward, and to thatextent expanding the cutting range of the chasers by moving.; themradially outward. TWhen the desired expansion oi the chasers has beeneffected, the set-screw 35 is' again turned home to bind the adjustingcollar 1.4i upon the shoulder 15 of the tapbodyl Reversely, if it isdesired, tor any reason, to contract the chasers 18, the collar 14 isloosened and turned counterclock wise, whereby it is moved rearwardlyupon the shoulder l5, this rearward movement being accompanied by theconcurrent rearward movement of the head l() and stem 11 and adjusting'moss-piece 13 under the pull of' the retracting-spring 29, thisoperation being also attended by the withdrawal or retraction oi' thechasers 18. The collar let is now again locked by the screw 35. It willthus be seen that by my invention, I am enabled to compensate for wear,as well as to adjust the chasers for Various iits of threads, my devicebeing characterized by the use of an adjusting' cross-piece passingdiametrically through the stein of a tapered adjusting-head andcontrolled by an adjusting-collar7 mounted upon the tap-body.

I claim: Y

n an adj usting tap, the combination with the slotted body and hollowshank thereof, of a tapered adjusting-head provided with a stem having adiametric slot, chasers located in the slots of the said body andcoupled with the said head for positive extension and contractionthereby, an adjusting crosspiece passing; through the diametri@ slot inthe stem of the head, a collar threaded upon the tap-body and co-a-ctingwith the said cross-piece ttor positively moving the same and hence thestem and head, forward, and a retracting-spring located within thehollow shank of the tap-body and connected with thel stem of the headfor exerting a constant effort to draw the same rearward.

ln testimony whereof, I have signed this specification in the presenceof two subseribing witnesses.

ALBERT F. BREITENSTEIN.

lWitnesses G. A. DnNrsoN, JOHN H. H. ALBEN.

